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Summary of Significant Accounting Policies - Derivatives (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Aug. 31, 2021	Dec. 31, 2020
Error Correction
Accumulated other comprehensive loss	$ (2,930)			$ (2,930)			$ (1,587)
Interest expense	3,289		$ 5,929	13,549	$ 19,810
Interest expense
Derivative
Interest expense				638
Recurring
Derivative
Liability measured at fair value	63			63			3,671
Level 2 | Recurring
Derivative
Liability measured at fair value	63			63			3,671
Interest rate swap | Designated as Hedging Instrument | Cash Flow Hedging
Derivative
Notional amount						$ 230,000
Interest rate (as a percent)						1.2757%
Recorded amortized cost	1,750			1,750		$ 1,966
Fair value of embedded derivative liability	63			63
Interest rate swap | Recurring
Derivative
Liability measured at fair value	63			63			3,671
Interest rate swap | Level 2 | Recurring
Derivative
Liability measured at fair value	63			63			$ 3,671
Interest rate swap, first agreement | Designated as Hedging Instrument | Cash Flow Hedging
Derivative
Notional amount	$ 230,000			$ 230,000
Interest rate (as a percent)	2.1284%			2.1284%
Adjustment for the ineffective hedging of interest rate swap agreement. | Prior period error correction adjustment
Error Correction
Accumulated other comprehensive loss		$ 3,033
Interest expense		$ 3,033

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